2000 V70R Whining/Buzzing Noise in Engine Bay

Post by **bmdubya1198** » 16 Apr 2019, 18:18

scot850 wrote: 16 Apr 2019, 17:20 The ETM initialises when you switch the ignition on. It whines and buzzes but for only a few seconds or so. If it continues to do so it be it is failing.

Neil.

I'm familiar with that noise, but I don't think that's what it is. It's similar, but the noise goes up and down, unlike the ETM noise. I can still hear the ETM though, so I'm pretty sure it's not the same noise.

callahanoffroad · Post by **callahanoffroad** » 17 Apr 2019, 08:24

It sounds like bearing clatter to me. I hear metal rubbing. It sounds very similar to the noises my belt tensioners made before my timing belt water pump debacle. But this is all speculation from your video! I'd pull the t/belt cover and see if it gets louder.

Post by **abscate** » 17 Apr 2019, 11:44

No, its a high pitched, like 1kHz buzz.

Im thinking alternator or possibly CVVT hub wear noise.

Post by **bmdubya1198** » 17 Apr 2019, 12:31

Yeah, it's definitely not mechanical like a bearing.

I listened to it this morning, thinking it may be the ETM as I listened in that area, but I definitely hear it most around the alternator area. Maybe it's the alternator, who knows. I'll take a closer listen this afternoon. I wouldn't be surprised if it was coming from the A/C compressor either, there's a wire nut on one of those wires from a previous owner. No idea why it's like that.

I won't 100% rule out the CVVT hub either, that makes a grinding noise on startup sometimes. However the buzz seems to be ahead of that area.

Wasamee · Post by **Wasamee** » 27 Apr 2019, 18:47

Have you made any progress with this issue? I have a 2000 S80 T6 that makes that exact same sound.

Post by **bmdubya1198** » 27 Apr 2019, 20:25

That’s interesting. I actually ended up rebuilding my original ETM with the Sacer contactless TPS, but the noise is still there. I don’t think it’s the ETM.
It sounds like it’s closer to the belts than the throttle, but it’s very hard to tell.

Post by **RickHaleParker** » 27 Apr 2019, 20:47

bmdubya1198 wrote: 27 Apr 2019, 20:25 It sounds like it’s closer to the belts than the throttle, but it’s very hard to tell.

Have you tried taking the serpentine belt off, starting it up to see if the noise stops?

Post by **bmdubya1198** » 27 Apr 2019, 22:20

RickHaleParker wrote: 27 Apr 2019, 20:47 Have you tried taking the serpentine belt off, starting it up to see if the noise stops?

I have not, but I’ll give that a try.

Wasamee · Post by **Wasamee** » 28 Apr 2019, 00:42

It seems to be coming from the back of the engine near the passenger side.

Post by **bmdubya1198** » 28 Apr 2019, 08:13

Wasamee wrote: 28 Apr 2019, 00:42 It seems to be coming from the back of the engine near the passenger side.

Have you checked for any vacuum leaks back there? Sometimes that can cause a whistling noise.